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Electronic and magnetic properties of IIA-V nitrides

Volnianska O, Bogusławski P

Materials Science Poland

2008

Vol. 26, No. 4

922--925

Electronic and magnetic properties of several IIA-V compounds have been analyzed using ab initio calculations. Two crystal structures have been considered, zinc blende (zb) and rock salt (rs), as well as the observed monoclinic phase for SrN. The results indicate that IIA-V nitrides in the rs phase are ferromagnetic half-metals. Ferromagnetism of cubic IIA-V compounds originates in the spin polarization of the p-shell of anions, as given by Hund's rule, which persists in solids after formation of bonds. Magnetism of the monoclinic SrN is due to its mixed valence character.

Week interlayer exchange coupling in Fe-Zr and Fe-Ti layered structures

Smardz L., Smardz K.

Materials Science Poland

2006

Vol. 24, No. 3

821--826

20nm-Fe/dZr-Zr/20nm-Fe and 20nm-Fe/dTi-Ti/20nm-Fe trilayers with wedged Zr and Ti sublayers were prepared at room temperature using UHV (5 × 10-10 mbar) RF/DC magnetron sputtering. Results showed that the Fe sublayers are ferromagnetically coupled up to Zr and Ti spacer thickness of about 1.5 and 2 nm, respectively. Furthermore, a weak antiferromagnetic (ferromagnetic) coupling of the Fe sublayers was observed for a Zr (Ti) thickness range between 1.5 and 3 nm (2 and 3.4 nm). The Fe sublayers are very weakly exchange coupled or decoupled for dZr > 3 nm and dTi > 3.4 nm. The small decoupling Ti and Zr thickness could be explained by spontaneous formation of a quasi-amorphous structure of the paramagnetic spacer during the deposition process.

Pulsed laser deposited amorphous magnetic films for strain detection.

Kahlen O., Benziger T., Regener D.

Inżynieria Materiałowa

2001

R. XXII, nr 4

423-425

Amorphous magnetic Fe-B-Si films have been produced by means of KrF laser ablation of Fe78B13Si9 amorphous magnetic ribbons. Laser fluence, repetition rate and the number of pulses were the variable parameters. TEM and AFM investigations of the deposited films exhibited a hetero-amorphous structure with dimensions in the 4-6 nm range. Physical parameters, such as the Curie temperature value and electrical resistance were comparable to those of the initial ribbon target material. Strain dependent eddy current measurements revealed a linear and very high signal response to applied strains, showing the films potential for a variety of applications until now performed by strain gauges.